i keep having tightening in my upper chest bottom throat say , it also makes me cough to almost clear it it only last seconds , sitting down can bring it on or exercise but very rare , but mostly its tight clothing i also get a rattling feeling in my tummy when i breath deeply , this has happen all week about 20 times a day and even though this has happen for years its only been now and again , have been feeling really breathless , lately 33 year old female no med non smoker